Materials Literature
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Capability of multiwalled carbon nanotubes (CNTs) to create in-depth gradients in properties and functionalities of conventional materials has been investigated for the first time. Functionally graded material (FGM) concept has also been employed for the first time to bridge conventional materials to their advanced na…
The rate of dissolution of aluminum and qualitative properties (gloss and uniformity) of its surface were examined as influenced by the concentration of H 3 PO 4 and fluorine-containing compounds and their nature, as well as by the temperature, pH, and various additions (acids, surfactants, inhibitors).
HFCBGA is a thermally enhanced FCBGA with its heat spreader extending heat conduction area by connecting itself to the rear side of the silicon die. A thermal interface material plays an important role as a heat conduction path. The thermal performance should be checked not only at time zero, several types of reliabil…
Abstract Two new polyoxypregnane glycosides, marsdenosides L and M ( 1 and 2 , resp.), along with five known polyoxypregnane glycosides, 3 – 7 , were isolated from the stem of Marsdenia tenacissima ( Roxb .) Wight et Arn . (Asclepiadaceae). The structures and relative configurations of the new compounds were elucidate…
Cr-doped AlN films are prepared by reactive dc magnetron cosputtering under a negative substrate bias ranging from 50 to 110 V. The bias induces variation of the texture from (002) to (110) orientation, enhances the stress and reduces the grain size in the films. All of the samples are ferromagnetic. The atomic magnet…
The fine structure of a hexagonal zinc oxide crystal doped with nickel ions of the composition Zn1 − x Ni x O has been studied using neutron diffraction and magnetic measurements. It is established that even at very low doping levels (x = 0.0004), the crystal undergoes local distortions in basal planes of the initial…
BACKGROUND: Nephrogenic systemic fibrosis is a sclerodermalike disease in patients with acute or chronic renal insuffiency related to administration of gadolinium-containing contrast agents. Previous studies have demonstrated clonal T-cell populations in the blood of patients with systemic sclerosis, suggesting that t…
In this paper is analyzing the current operating conditions of one of electric arc furnace (EAF) in order to evaluate the best option to solve the energy consumption problem. Also we evaluate existing process' equipment performance and point to improvement opportunities. Recommendations for the best operating set-poin…
Scientists can now manipulate the state of polarization across a laser beam at the wavelength scale. Such engineering allows for optimal plasmonic focusing that could be translated into efficient coupling for plasmonic circuits, high-resolution imaging, biochemical sensing and thin-film characterization.
New compounds Pb 4 La(GeO 4 ) 2 (VO 4 )(I) and Sr 5 La 5 (GeO 4 ) 5 (VO 4 )O(II) were prepared and identified. Compound I has the structure of apatite, a = 10.108(1) Å, c = 7.369(1) Å, V = 652.1(2) Å 3 . Compound II has the structure of oxyapatite, a = 9.9028(5) Å, c = 7.3162(4) Å, V = 621.34(6) Å 3 .
This mini review presents our recent developments in porphyrin-modified electrodes for solar energy conversion. Various porphyrins have been assembled on nanostructured semiconducting electrodes to achieve efficient photocurrent generation. First, porphyrins have been organized with fullerenes onto semiconducting elec…
Eu 3+ doped silica films have been prepared by sol–gel method and employed as luminescent down-shifting layer on the front side of a crystalline Si solar cell to improve their conversion efficiency. Measurements under standard test conditions (AM1.5, 100 mW/cm 2 ) show the conversion efficiency of Si solar cell with s…
Natural weathering of hornblende from the Tallulah Falls Formation (Georgia, U.S.A.) takes place under thoroughly leached, oxidizing conditions. At the earliest stage of weathering, corrosion of hornblende forms denticulated terminations, with only minimal porosity apparent within the partially pseudomorphic kaolin-gr…
Pure and 10 mol% Fe 3+ doped CeO2 nanocrystals were synthesized by hydrothermal method using two different basic solutions (NH4OH and NaOH). All the samples were calcinated at 140 C and 200 C. The characterization of crystalline structure, vibrational and optical properties was performed using X-ray diffraction, Raman…
Carbon nanotubes have revolutionalized various areas of science and technology. Conceptually, carbon nanotubes can be thought of as all sp2 carbons arranged in graphene sheets, which have been rolled up to form a seamless hollow tube. The tubes can be capped at the ends by a fullerene type hemisphere and can have leng…
We optically characterized colloidal gold nanoparticles using polarized light scattering which is utilized to investigate both optical anisotropy and aspect ratio of the particle and to observe particle's rotational dynamics. By monitoring time-trace of the polarized scattering from a particle, we could observe rotati…
Silicon carbide is known for its large bandgap and suitability to make highly sensitive ultraviolet photo-detectors. These devices show appreciable quantum efficiencies in the 240 nm - 350 nm wavelength range in combination with low dark currents. We present recent results on 4H-SiC avalanche photodiode arrays and SiC…
The structure of single-phase glasses in the SrO-B 2 O 3 -SiO 2 system has been studied by the small-and large-angle X-ray scattering technique. The glasses containing 35, 40, and 45 mol % SrO upon equimolar replacement of B 2 O 3 by SiO 2 have been investigated. It has been demonstrated that the glasses do not contai…
To understand the fascinating multiferroicity observed in CoCr2O4, Monte Carlo simulation is performed on a three-dimensional spinel lattice with classical Heisenberg spins. The conical spin order is confirmed to be the origin of the peculiar magnetoelectric behavior with coexisting magnetization and ferroelectric pol…
Technological conditions providing the formation of CdS x Se1−x semiconductor crystal grains with sizes ranging from 2 to 8 nm in a silicate glass matrix have been determined. As the temperature of forming annealing increases, the size of crystal grains increases without changes in their crystal structure and composit…